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Lake Alamosa

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Journal Article
Published: 01 December 2017
Rocky Mountain Geology (2017) 52 (2): 107–117.
... the evolution of ancient Lake Alamosa, which filled much of the San Luis Valley in the Pliocene and Pleistocene. Thick intervals of massive clay, recovered at the well (BP-3-USGS [U.S. Geological Survey]), represent deposition as part of this extensive lacustrine environment. Oriented paleomagnetic samples from...
FIGURES | View All (4)
Series: GSA Special Papers
Published: 01 April 2013
DOI: 10.1130/2013.2494(01)
... From Pliocene to middle Pleistocene time, a large lake occupied most of the San Luis Valley above 2300 m elevation (7550 ft) in southern Colorado. This ancient lake accumulated sediments of the Alamosa Formation (Siebenthal, 1910), for which the lake is herein named. The existence of this lake...
Series: GSA Field Guide
Published: 07 September 2016
DOI: 10.1130/2016.0044(13)
EISBN: 9780813756448
... of Lake Alamosa; Qay—late Pleistocene alluvium; Qa—late Pleistocene to Holocene alluvium; Qed—late Pleistocene to Holocene eolian deposits; Qfp—Holocene floodplain and overbank deposits; Qaa—active alluvium. Figure 6. Middle Pleistocene stratigraphic section exposed in the Ba-chus pit. Modified...
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Image
Location of BP-3-USGS well near Great Sand Dunes National Park and Preserve...
Published: 01 December 2017
Figure 1. Location of BP-3-USGS well near Great Sand Dunes National Park and Preserve in Alamosa County of southern Colorado (modified from Grauch et al., 2015 ). Also shown are the: (1) inferred limit of the last highstand of Pliocene and Pleistocene Lake Alamosa before its disappearance (from
Image
(A) Location of the Rio Grande rift (shaded) and River; red box shows locat...
Published: 26 April 2019
Figure 1. (A) Location of the Rio Grande rift (shaded) and River; red box shows location of Figure 1B . (B) Generalized geology of the northern Rio Grande rift and the location of the pluvial Lake Alamosa (after Machette et al., 2013 ), Figure 1C (white box), and Figure 1D (from circled N
Journal Article
Journal: Geosphere
Published: 02 April 2021
Geosphere (2021) 17 (3): 898–931.
... after the ignimbrite eruption ( Mills and Coleman, 2013 ). Elsewhere in the SRMVF, the ca. 23 Ma Lake City caldera contains postcaldera syenite intrusions that represent mushy magma that did not erupt, while monzonite intrusions represent chemically distinct, less-evolved magma emplaced after caldera...
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Journal Article
Journal: AAPG Bulletin
Published: 01 February 1957
AAPG Bulletin (1957) 41 (2): 181–196.
... sandstones in this area being included in the Mancos shale. FIG. 2. —Sections of Gallup sandstone and associated beds of Upper Cretaceous age from Alamosa Creek Valley area, Socorro and Catron counties, north to Ambrosia Lake area, McKinley County, New Mexico. The name Miguel formation...
FIGURES | View All (4)
Image
Photomicrographs (cross-polarized light) of Platoro intrusions and the Chiq...
Published: 02 April 2021
) Equigranular Alamosa River monzonite with granophyric texture; right panel is shown in cathodoluminescence (SRM22). (C) Alum Creek monzonite porphyry (DC1). (D) Jasper monzonite (SRM25). (E) Cornwall Mountain quartz monzonite porphyry (SRM23). (F) Lake Annella andesite porphyry (17AG06). (G) Bear Creek
Image
—Sections of Gallup sandstone and associated beds of Upper Cretaceous age f...
Published: 01 February 1957
FIG. 2. —Sections of Gallup sandstone and associated beds of Upper Cretaceous age from Alamosa Creek Valley area, Socorro and Catron counties, north to Ambrosia Lake area, McKinley County, New Mexico.
Journal Article
Journal: Geosphere
Published: 26 April 2019
Geosphere (2019) 15 (3): 820–838.
...Figure 1. (A) Location of the Rio Grande rift (shaded) and River; red box shows location of Figure 1B . (B) Generalized geology of the northern Rio Grande rift and the location of the pluvial Lake Alamosa (after Machette et al., 2013 ), Figure 1C (white box), and Figure 1D (from circled N...
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Journal Article
Journal: The Leading Edge
Published: 01 August 2013
The Leading Edge (2013) 32 (8): 882–891.
... , 10.1130/B26213.1 . Machette M. N. , Thompson R. A. , Marchetti D. W. , and Smith R. S. U. , 2013 , Evolution of ancient Lake Alamosa and integration of the Rio Grande during the Pliocene and Pleistocene , in Hudson M.R. and Grauch V. J. S. , eds., New...
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Image
Geologic map showing location of measured sections of Gallup sandstone and ...
Published: 01 February 1957
FIG 1 Geologic map showing location of measured sections of Gallup sandstone and associated beds from the Alamosa Creek Valley area, Socorro and Catron Counties north to the Ambrosia Lake area, McKinley County, New Mexico. Generalized from Preliminary geologic map of northwestern part of New
Journal Article
Journal: Geosphere
Published: 30 September 2019
Geosphere (2019) 15 (6): 1893–1926.
... from Table 2 ). Dashed black lines mark boundaries between geographic segments of the Dulce dike swarm in relation to distance from the Platoro locus (segment identifier in parentheses), as used in chemical plots ( Figs. 6 , 11 – 13 ). Intrusion locations: Am—Archuleta Mesa sill; AR—Alamosa River...
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Journal Article
Journal: AAPG Bulletin
Published: 01 November 1965
AAPG Bulletin (1965) 49 (11): 2041–2075.
...) and wedge out or become thin and discontinuous northeastward. The Alamosa segment is a topographically, nearly flat interior drainage basin whose deepest part is northeast and east of Alamosa where several lakes and playas are present. In this area sediments of Pliocene or Pleistocene age are more than...
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Journal Article
Journal: SEG Discovery
Published: 01 July 1994
SEG Discovery (1994) (18): 1–32.
... are confirmed by the that some may go into production offers new research opportunities new study. Three economically attractive pipes have been identified to academia and government geologists, new exploration and to date: Panda Lake (118 carats/100 tonnes), Fox Lake, and Koala exploitation challenges...
Image
(A) Reconstructed topography of the original 10 Ma surface produced by remo...
Published: 01 August 2013
features are: Kaibab uplift (KU); Monument uplift (MU); proto–Lake Bonneville (LB); Alamosa Lake (A).
Journal Article
Journal: Geosphere
Published: 01 June 2017
Geosphere (2017) 13 (3): 974–990.
.... Locally, the dominant shallow constituent of the Santa Fe Group is the Alamosa Formation ( Siebenthal, 1910 ), composed mainly of thin beds of gravel, sand, silt, and clay that are poorly to moderately consolidated ( Brister and Gries, 1994 ; Madole et al., 2008 , 2013 ). Quaternary deposits at GRSA...
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Image
Schematic west-east section through the Platoro caldera complex. (A) Early ...
Published: 02 April 2021
is uncertain, and thus its depiction is schematic. (B) Section through the Platoro caldera complex post–28 Ma. Intracaldera intrusions such as the Alamosa River monzonite (ARM) intrude the Chiquito Peak Tuff and Summitville Andesite. The Cornwall Mountain resurgent block is not depicted for simplicity
Journal Article
Journal: Geosphere
Published: 24 October 2018
Geosphere (2018) 14 (6): 2487–2504.
... of the extent shown in Figure 1 ( Fig. 14D ), and some barchan dunes are even visible at the northwestern edge of the fans studied here ( Figs. 1 and 11 ). If the fans studied here follow the patterns observed at other sites proximal to playa dust sources, such as the former basin of Lake Alamosa...
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Journal Article
Journal: Geosphere
Published: 06 October 2020
Geosphere (2020) 16 (6): 1457–1478.
...–Pleistocene Sierra Ladrones basin-fill deposits are vertically incised up to ∼130 m in the Socorro Basin and in adjacent rift basins. The transition from basin filling to valley incision was aided or possibly driven by a major lake overflow event at Lake Alamosa (ca. 440 ka), eventually resulting...
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